Combined pocket rule, square, and bevel.



THEODORE KALMA, OF SOUTH PASADENA, CALIFORNIA.

COMBINED POCKET RULE, SQUARE, AND BEVEL,

Specification of Letters Patent.

Application filed February 20.1907. Serial No. 358.517.

Patented Dec. 3, 1907. j

T 0 all whom it may concern:

Be it known that I, THEODORE KALMA, a citizen of Sweden, residing at South Pasadena, in the county of Los Angeles and State of California, have inventeda new and useful Combined Pocket Rule, Square, and Bevel, of which the following is a specification.

This invention relates to a class of jointed rules, in which a brace is pivoted to one of the jointed sections and is adapted to engage another of the jointed sections in order to hold the two sections at a predetermined angle, so that the instrument may be used as a t1y-square or as a scribing or measuring square or as a bevel.

The most frequent use made of try-squares requires that the object to which the square is applied shall be embraced by the square and an object of this invention is to provide a cheap and simple, foldable try-square, which when extended will afford an unobstructed angle to embrace the object to be tested.

Another object is convenience of adjusting, opening and closing the instrument.

The accompanying drawings illustrate the invention I Figure 1 is a view of a foldable pocket rule, constructed in accordance with this invention and open in position for use as a trysquare. Fig. 2 is a side elevation of the same. Fig. 3 is an enlarged fragmental elevation from the same side as Fig. 2. Fig. 4 is an enlarged fragmental plan detail viewed from the same side as Fig. 1. Fig. 5 is an enlarged cross sectional detail on line 00 Figs. 1, 2, 3 and 4.

In all of the views the rule is shown with only one section unfolded. It is to be understood that the sections shown folded parallel with each other may be unfolded in the usual way.

The sections 1, 2 of the rule are pivoted together by a pivot 3 arranged at a distance from either end of either section, so that when the rule is unfolded, the sections will cross each other and the section 1 will proj ect beyond both edegs of the section 2. The face of section 2 which is next to section 1 is provided with one or more keepers 4:, 5, 6, in the form of depressions in such face.

7 is a spring arm or brace slightly bent or curved downwardly, and provided with a detent 8 adapted to enter and seat in the keepers respectively. Said brace is pivoted at 9, to the projecting limb 10 of the section 1, of the foldable" rule.

11 designates a keeper for the brace in the outer face of the section 1 of the rule to which the brace is pivoted, said keeper 11 corresponding to the other keepers and being adapted to retain the detent of the arm or brace 7 to hold said arm or brace in folded position indicated by dotted lines in Fig. 1.

The keepers may be variously formed, but in the form I deem preferable the final seat for the detent consists in a hole 12, intermediate the edges of the member 2 of the rule. Such hole is located exactly at the point at which the detent must be in order to hold the members 1, 2 at the required angle to each other. Preferably the keeper also comprises a guide in the form of a channeled. portion 13, extending from the edge of the section 2 to the hole 12 and gradually diminishing in depth from its flaring mouth to the rim of the hole. The spring arm or brace 7 is so mounted that when the arm is swung free from any keeper, the end of the detent is on a level with the outer edge of the sloping floor of the flaring channel, so that in unfolding and adjusting the device, the operator will be able to bring the detent into the mouth of the flaring guide channel and then as he moves it toward its bracing position, the sloping floor of such channel and the converging walls thereof will guide the detent into the hole which forms the final kee er therefor. This construction is prefera ly employed in all the places where it is reuired.

It will be noted from Fig. 1 that by the construction described, I have formed a foldable try-square having its inner angle clear and free from obstruction.

The several kee ers are located at such positions respective y as to hold the detent in the positions res ectively, required to cause the sections of t e rule to be held at those angles, respectively, most commonly required as for instance, angles of 45 90 and so on.

What I claim is 1. A foldable pocket rule the sections of which are pivoted to each other by a pivot located at a distance from the ends of the sections, so that the sections cross each other when unfolded, one of the sections being provided with a keeper, such keeper facing the other section, and a brace pivoted to the shorter limb of the other section and provided with means to engage said keeper to hold the sections in unfolded. position with free unobstructed edges in the inner angle formed by their longer arms.

2. A foldable rule'having two sections pivoted together by a pivot located at a distance from the ends thereof and arranged. to cross each other when unfolded, one of said sections being provided in its longer limb with a keeper on the face thereof next the othersection, and a spring brace pivoted to the shorter limb of the other section and provided with a detent to engage said keeper when the'sections arc unfolded thus to form a try-square or bevel free from obstructions on its inner angle.

3. A foldable pocket rule comprising sections pivotally secured together at or near the ends thereof, and arranged. to cross each other when unfolded, one of said sections being provided in the longer end thereof with a keeper secured to the face of the same provided. with channels or grooves terminating in indentations and a resilient member pivotally secured to one end of said. sections and provided with a detent, arranged to slide in said grooves or channels in. said keeper and engaging said indentations whereby to form a try-square or bevel, and a seat for said resilient member when out of use.

In testimony whereof, I have hereunto set -my hand at Los Angeles California this 12th day of February 1907.

TI-IEO. KALMrL In presence of JAMES R. TowNsENn, M. BEULA'H TowNsEND. 

